[Unit]
Description=Change owner and group of /dev/gpiomem for RPI.GPIO python API
ConditionPathExists=/dev/gpiomem

[Service]
User=root
Group=root
ExecStart=/bin/sh -c '/bin/chown root:gpio /dev/gpiomem && /bin/chmod g+rw /dev/gpiomem'

[Install]
WantedBy=multi-user.target